Thanks Maxxi, think I get it. So the tennant in this situation has been served a S21, giving 2 months notice that they need to find somewhere new to live. Once that 2 months is up, they give the keys back and leave the place in good order. Seems reasonable to me, and I have in the past been in a situation where I have been given noitce so I looked for a new gaff. Seems the 2 month notice period will be on 23rd Oct (OP says served on 23rd Aug) so I dont see what the problem is yet as we are 2 weeks away from the end of the notice period. Unless the tennant is saying they are not leaving after the 23rd Oct, then I dont see how that is the right thing to do.